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# You may distribute under the terms of either the GNU General Public License
# or the Artistic License (the same terms as Perl itself)
#
# (C) Paul Evans, 2017-2019 -- leonerd@leonerd.org.uk
package Devel::MAT::Tool::Callers 0.53;
use v5.14;
use warnings;
use base qw( Devel::MAT::Tool );
use constant CMD => "callers";
use constant CMD_DESC => "Display the caller stack";
use constant CMD_OPTS => (
pad => { help => "show PAD contents",
alias => "P" },
);
=head1 NAME
C<Devel::MAT::Tool::Callers> - display the caller stack
=head1 DESCRIPTION
This C<Devel::MAT> tool displays the captured state of the caller stack,
showing which functions have been called, and what their arguments were.
=cut
=head1 COMMANDS
=head2 callers
pmat> callers
caller(0): &main::func => void
at program.pl line 4
$_[0]: SCALAR(PV) at 0x55c2bdce2778 = "arguments"
$_[1]: SCALAR(PV) at 0x55c2bdce2868 = "go"
$_[2]: SCALAR(PV) at 0x55c2bdce26e8 = "here"
Prints details of the caller stack, including arguments to functions.
Takes the following named options:
=over 4
=item --pad, -P
Additionally show the contents of the active PAD at this depth.
=back
=cut
sub run
{
my $self = shift;
my %opts = %{ +shift };
my @contexts = $self->df->contexts;
foreach my $idx ( 0 .. $#contexts ) {
my $ctx = $contexts[$idx];
my $what;
for( $ctx->type ) {
if( $_ eq "SUB" ) {
$what = String::Tagged->from_sprintf( "%s=%s",
Devel::MAT::Cmd->format_sv( $ctx->cv ),
Devel::MAT::Cmd->format_symbol( $ctx->cv->symname ),
);
}
elsif( $_ eq "TRY" ) {
$what = "eval {...}";
}
elsif( $_ eq "EVAL" ) {
$what = String::Tagged->from_sprintf( "eval (%s)",
Devel::MAT::Cmd->format_value( $ctx->code->pv, pv => 1 ),
);
}
}
Devel::MAT::Cmd->printf( "%s: %s => %s\n",
Devel::MAT::Cmd->format_note( sprintf "caller(%d)", $idx ),
$what,
Devel::MAT::Cmd->format_note( $ctx->gimme ),
);
Devel::MAT::Cmd->printf( " at %s\n",
$ctx->location,
);
next unless $ctx->type eq "SUB";
my $args = $ctx->args or next;
my @args = $args->elems;
my $doneargs;
$doneargs++, Devel::MAT::Cmd->printf( " %s: %s\n",
Devel::MAT::Cmd->format_note( "\$_[$_]", 1 ),
Devel::MAT::Cmd->format_sv_with_value( $args[$_] )
) for 0 .. $#args;
my $cv = $ctx->cv;
Devel::MAT::Cmd->printf( " cv=%s\n",
Devel::MAT::Cmd->format_sv( $cv ),
);
( my $depth = $ctx->depth ) > -1 or next;
my $pad = $cv->pad( $depth );
if( $opts{pad} ) {
Devel::MAT::Cmd->printf( " curpad=%s\n",
Devel::MAT::Cmd->format_sv( $pad )
);
require Devel::MAT::Tool::Show;
Devel::MAT::Tool::Show->show_PAD_contents( $pad );
}
else {
foreach my $name ( '$self' ) {
my $self_padix = $cv->padix_from_padname( $name )
or next;
if( my $sv = $pad->elem( $self_padix ) ) {
$doneargs++;
Devel::MAT::Cmd->printf( " %s: %s\n",
Devel::MAT::Cmd->format_note( $name, 1 ),
Devel::MAT::Cmd->format_sv_with_value( $sv ),
);
}
else {
$doneargs++;
Devel::MAT::Cmd->printf( " no %s\n",
Devel::MAT::Cmd->format_note( $name, 1 ),
);
}
}
}
$doneargs or
Devel::MAT::Cmd->printf( " %s\n",
Devel::MAT::Cmd->format_note( "(no args)", 1 ),
);
}
}
=head1 AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
=cut
0x55AA;
|
